I use IDEA 11, updated to its latest version. I opened an Eclipse project in IDEA, and the text color of some folders and files are light-brown colored, while others are black as normal.
Look:
1) 
2) 
I tried rebuilding the project, but it did not help. What do the different colors mean?
These colors represent the file status
File Status Highlights – http://www.jetbrains.com/idea/webhelp/file-status-highlights.html
Refreshing Status – http://www.jetbrains.com/idea/webhelp/refreshing-status.html